Research On Multi-source Network Coding Homomorphic Ring Signature And Multi-signature

With the advent of the network age,the Internet has entered the realistic world.Nowadays,people's daily work and life can no longer be completely separated from the Internet.At the same time,people 's requirements for network speed have become higher and higher,however,traditional network transmission technology can no longer meet people's growing network performance requirements.In order to improve network resource utilization,the concept of multi-source network coding has been proposed,it has greatly improved network data transmission.But multi-source network coding brings the problem of security,and this becomes one of the obstacles in the practical application of multi-source network coding.How to ensure its security of transmitted data while maintaining the efficient transmission performance has become the research focus of today's multi-source network coding.Because the traditional signature technology is not suitable for multi-source network coding,this thesis designs two innovative cryptography schemes based on the theory basis of multi-source network coding and homomorphic signature: a homomorphic ring signature scheme for multi-resource network coding using Schnorr mechanism and a multi-signature scheme for multi-resource network coding using ECDSS mechanism.The two research results are listed as follows.(1)Based on the theory knowledge of multi-source network coding,the thesis proposes a homomorphic ring signature scheme by integrating Schnorr signature mechanism and homomorphic signature algorithm.The security of the proposed cryptography scheme depends on the difficulty of discrete logarithm(DL)problem and computational Diffie-Hellman(CDH)problem.In this cryptography scheme,each source node signs the message with its own private key,and the sink node uses the public key to verify;and the concept of time in the ring signature can make it resist pollution attacks and replay attacks.(2)By studying the theory knowledge of multi-source network coding,the thesis presents a multi-signature scheme for multi-source network coding by using elliptic curve signature and multi-signature scheme.In this cryptography algorithm,each source node can be regarded as a group of users in the broadcast network,each group has its own signature entity which signs the message with its own private key,and the sink node collects the verification and forms the true signature of the message.Adding a set of generation parameters makes it avoid both eavesdropping attacks and pollution attacks.